319305409 has 2 divisors, whose sum is σ = 319305410. Its totient is φ = 319305408.

The previous prime is 319305403. The next prime is 319305419. The reversal of 319305409 is 904503913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171610000 + 147695409 = 13100^2 + 12153^2 .

It is a cyclic number.

It is not a de Polignac number, because 319305409 - 2²¹ = 317208257 is a prime.

It is a super-4 number, since 4×319305409⁴ (a number of 35 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (319305403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159652704 + 159652705.

It is an arithmetic number, because the mean of its divisors is an integer number (159652705).

Almost surely, 2^319305409 is an apocalyptic number.

It is an amenable number.

319305409 is a deficient number, since it is larger than the sum of its proper divisors (1).

319305409 is an equidigital number, since it uses as much as digits as its factorization.

319305409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 319305409 is about 17869.1188646782. The cubic root of 319305409 is about 683.4951310438.

The spelling of 319305409 in words is "three hundred nineteen million, three hundred five thousand, four hundred nine".